and other Animals. 
305 
half-past 10 to 2 p. m. ; from 2 p. m» to 5 was employed chiefly 
in reading ; from 5 to 6 took gentle horse exercise ; dined spa- 
ringly between 7 and 8, drank only one glass of wine ; and, 
lastly, from 9 to 11 was most of the time employed in writing. 
It would be tedious to give other instances illustrative of 
the change of the temperature of man, — increasing with the 
temperature of the air, and falling as the atmosphere cools, 
within certain bounds. The preceding instance, which has 
been confirmed by various experiments I have made, is the 
most minute and satisfactory that I can bring forward. The 
subject is inconvenient to make experiments on, and particular- 
ly for a person whose time is not his own, and as a professional 
man has seldom a day of leisure, the whole of which he can 
spend as he chooses. Nor is it easy, in this inquiry, to arrive 
at accurate results, — at any thing more than an approximation 
to the truth, — in consequence of the effects of a number of cir- 
cumstances, and particularly of health, diet, and exercise, which 
cannot be duly appreciated until they have been more minutely 
investigated. 
II. Of the Temperature of different Races of Men. 
At the Cape of Good Hope, at the Isle of France, and in 
Ceylon, I have had opportunities of trying the temperature of 
several different races of men. 
At the Cape, in the winter of 1816, on the 24th of May, 
at noon, when the temperature of the air was about 60°, I pre- 
vailed, with some difficulty, on five Hottentots to allow me to 
put a thermometer into their mouths, for they were afraid of 
the instrument ; and when I saw them again, one blamed it 
for an illness with which he was seized soon after submitting to 
the experiment. I found their temperatures the following. 
No. Temp, under Tongue. 
1. 98° 
2. 96.5 
3. 96.5 
4. 97-75 
5. 99.5 
These Hottentots, I may remark, were in the service of our 
government, employed as artillery-drivers. They were in good 
health, and resting at their barrack at the time. Their ages 
varied from twenty -five to forty, judging from their looks, for 
